Cub Cadet SC 621 Operator's Manual
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Cub Cadet SC 621 Operator's Manual

21-inch, 6-speed lawn mower
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Operator's Manual
IMPORTANT: Read safety rules and instructions carefully before operating equipment.
Warning:
This unit is equipped with an internal combustion engine and should not be used on or near any unimproved forest-
covered, brush-covered or grass-covered land unless the engine's exhaust system is equipped with a spark arrester meeting
applicable local or state laws (if any). If a spark arrester is used, it should be maintained in effective working order by the operator.
In the State of California the above is required by law (Section 4442 of the California Public Resources Code). Other states may have
similar laws. Federal laws apply on federal lands. A spark arrester for the muffler is available through your nearest engine authorized
service dealer or contact the service department, P.O. Box 368023 Cleveland, Ohio 44136-9722.
CUB CADET CORP. P.O. BOX 368023 CLEVELAND, OHIO 44136-9722
ECO # 3520
PRINTED IN U.S.A.
21-inch, 6-Speed

Lawn Mower

Model SC 621
FORM NO. 770-10090B.fm
(11/2000)

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Summary of Contents for Cub Cadet SC 621

  • Page 1: Lawn Mower

    Federal laws apply on federal lands. A spark arrester for the muffler is available through your nearest engine authorized service dealer or contact the service department, P.O. Box 368023 Cleveland, Ohio 44136-9722. CUB CADET CORP. P.O. BOX 368023 CLEVELAND, OHIO 44136-9722 ECO # 3520 FORM NO.

  • Page 2: Table Of Contents

    If you have difficulty assembling this product or have any questions regarding the controls, operation or maintenance of this unit, please call the Cub Cadet Customer Dealer Referral Line at 1-(800)-528-1009. Please have your unit’s model number and serial number ready when you call.

  • Page 3: Important Safe Operation Practices

    SECTION 1: IMPORTANT SAFE OPERATION PRACTICES WARNING: This symbol points out important safety instructions which, if not followed, could endanger the personal safety and/or property of yourself and others. Read and follow all instructions in this manual before attempting to operate this machine. Failure to comply with these instructions may result in personal injury.

  • Page 4: Slope Operation

    other safety protective devices in place and working. power mower. Children 14 years old and over should Never operate mower with damaged safety devices. read and understand the operation instructions and Failure to do so, can result in personal injury. safety rules in this manual and should be trained and 21.
  • Page 5 meet the original equipment specifications may lead to expose moving parts or allow objects to be thrown. For improper performance and compromise safety!” safety protection, frequently check components and Mower blades are sharp and can cut. Wrap the blade or replace immediately with original equipment wear gloves, and use extra caution when servicing them.

  • Page 6: Slope Gauge

    SECTION 2: SLOPE GAUGE Use this page as a guide to determine slopes where you may not operate the lawn mower safely.

  • Page 7: Assembling Your Lawn Mower

    SECTION 3: ASSEMBLING YOUR LAWN MOWER Unpacking Assembling Handle • Remove staples, break glue on top flaps, or cut • For shipping purposes, the grass bag was packed tape at carton end and peel along top flap to open. on top of the unit. Remove the grass bag and set it •...
  • Page 8 Cable Tie Inner Hole Lower Lower Handle Handle Hairpin Clip Handle Mounting Bracket Figure 7 NOTE: Make sure the drive cable is routed around the outside and above the lower handle so as not to interfere with the grass bag attachment. Figure 5 •...

  • Page 9: Know Your Lawn Mower

    SECTION 4: KNOW YOUR LAWN MOWER Compare the illustrations in Figure 9 with your lawn mower to acquaint yourself with the location and working of various controls and adjustments on the equipment. Always wear safety glasses while performing any adjustments on the mower.

  • Page 10: Operating Your Lawn Mower

    SECTION 5: OPERATING YOUR LAWN MOWER Gas and Oil Fill-Up rewind slowly. Pull rope with a rapid, continuous, full arm stroke. Keeping a firm grip on the starter • Service the engine with gasoline and oil as handle, let the rope rewind slowly. instructed in the accompanying engine manual.
  • Page 11 • To unlock caster: Lift and place the lock pin in the smaller hole to allow casters to rotate freely. See Chute Lift bag Figure 10. Door here WARNING: Do not mow on slopes with Lower Handle of Grass Bag casters unlocked since the mower can drift downhill.

  • Page 12: Making Adjustments

    Using Your Rotary Mower WARNING: If your mower strikes a foreign object, stop the engine. Remove wire • Make sure that lawn is clear of stones, sticks, wire, from spark plug, thoroughly inspect for any or other objects which could damage the lawn damage, and do necessary repairs before mower or its engine.

  • Page 13: Maintaining Your Lawn Mower

    Drive Clutch Control of the mower beside the engine. Follow steps below to adjust the shift lever. The drive clutch control adjustment wheel is located in • Start the engine and place speed control lever in the drive clutch control handle housing and is used to the sixth speed position.

  • Page 14: Lubrication

    Lubrication WARNING: When removing the cutting blade for sharpening or replacement, protect Blade Control hands by wearing heavy gloves or using a • Lubricate the pivot points on the blade control heavy rag to hold the blade. handle and the brake cable at least once a season •...

  • Page 15: Replacing Drive Belt

    SECTION 8: SERVICING YOUR MOWER Replacing Drive Belt • Disconnect the spark plug wire and ground it Transmission against the engine. Pulley • Drain the fuel tank or place a piece of plastic Belt beneath the cap to prevent gasoline leakage. •...

  • Page 16: Off-Season Storage

    Lower Lower Pulley Pulley Half Half Belt Crankshaft Belt Belt Guard Pin Figure 27 Figure 25 • Pivot the control arm back to its original position • Place the new belt over the transmission pulley. and reinstall the six-speed cable into the slot. See Start the belt in the pulley groove and rotate the Figure 28.

  • Page 17: Troubleshooting

    1. Place all four wheels in same height correctly. position. 2. Dull blade. 2. Sharpen or replace blade. Refer to separate engine manual packed with your mower for more engine related information. NOTE: For repairs beyond the minor adjustments listed above, contact your nearest Cub Cadet dealer.

  • Page 18: Parts List

    SECTION 11: PARTS LIST FOR MODEL SC 621 Transmission Assembly for Reference only Pulley Assembly for Reference only NOTE: For painted parts, please refer to the list of color codes below. Please add applicable color code, wherever needed, to the part number to order a replacement part.
  • Page 19 Model SC 621 Ref. Ref. Part No. Description Part No. Description 710-0134 Scr. Carr. 1/4-20 x .62 682-9021A Caster Assembly L.H. 710-0654A Scr. TT:3/8-18:1.00 682-9024 Caster Bracket Assembly: RH 710-0703 Carriage Scr. 1/4-20 x .750 682-9026 Caster Bracket Assembly: LH 712-0397 Wing Nut 1/4-20 711-1146...
  • Page 20 Model SC 621 NOTE: For painted parts, please refer to the list of color codes below. Please add applicable color code, wherever needed, to the part number to order a replacement part. For instance, if a part numbered 700-xxxx is painted Cub Yellow, the part number to order would be 700- xxxx-0716.
  • Page 21 Multi-Speed Pulley Assembly Ref. Part No. Description 746-0939 Speed Selector Cable, 53” 656-0613 Multi-Speed Pulley Assembly 710-0167 Carriage Bolt, 1/4-20 x. 5 NOTE: For painted parts, please refer to 710-0896 Self-Tapping Screw, 1/4-20 x .625 the list of color codes below. Please add 711-1114 Pivot Shaft applicable...

  • Page 22: Transmission Assembly

    Transmission Assembly IMPORTANT: For a proper working machine, use Ref. Part No. Description Factory Approved Parts. V-BELTS are specially designed to engage and 712-3025 Hex Jam Nut, 5/16-24 disengage safely. A substitute (non OEM) V-Belt can be 736-0425 Bell Wash. .325 x .930 x .045 dangerous by not disengaging completely.
  • Page 23 Decorative & Safety Labels...

  • Page 24: Cleveland, Ohio

    How to obtain service Contact your authorized Cub Cadet servicing dealer who sold you your Cub Cadet equipment. If this dealer is not available, see the Consumer Yellow Pages under “lawn mowers” for the name of a dealer near you.

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Src 621

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